1861988882 has 16 divisors (see below), whose sum is σ = 3008539800. Its totient is φ = 859176192.

The previous prime is 1861988879. The next prime is 1861988911. The reversal of 1861988882 is 2888891681.

It can be written as a sum of positive squares in 4 ways, for example, as 561737401 + 1300251481 = 23701^2 + 36059^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 205994 + ... + 214842.

Almost surely, 2^1861988882 is an apocalyptic number.

1861988882 is a deficient number, since it is larger than the sum of its proper divisors (1146550918).

1861988882 is a wasteful number, since it uses less digits than its factorization.

1861988882 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16957.

The product of its digits is 3538944, while the sum is 59.

The square root of 1861988882 is about 43150.7691936077. The cubic root of 1861988882 is about 1230.2471316944.

The spelling of 1861988882 in words is "one billion, eight hundred sixty-one million, nine hundred eighty-eight thousand, eight hundred eighty-two".